Pay load is defined as the difference between the mass of displaced air and the mass of the balloon. Calculate the pay load when a baloon of radius 10 m, mass 100 kg is filled with helium at 1.66 bar at 27°C. [Density of air = 1.2 kg${{m}^{-3}}$, R = 0.083 bar d${{m}^{3}}$${{K}^{-1}}$${{mol}^{-1}}$].
